The term amber or "oriental" is often used to refer to fragrances that prominently feature sweet notes, powdery notes, vanilla, cistus labdanum and animal notes. It is important to distinguish between the perfumery accord amber (a combination of vanilla and resins—most often cistus labdanum, Peru balsam and Tolu balsam), ambergris (the oxidized excretion of a sperm whale), and fossilized amber (the typically yellowish, fossilized resin of extinct coniferous trees of the Tertiary period). These terms should never be used interchangeably and, unless otherwise noted, in the context of perfumery, amber will always mean the combination of vanilla and resins.